#include<cstdio>
#include<iostream>
#include<cstring>
#include<unistd.h>

int main()
{
    //库函数
    printf("hello printf\n");
    fprintf(stdout,"hello fprintf\n");
    const char* s= "hello fwrite\n";
    fwrite(s,strlen(s),1,stdout);

    //系统调用
    const char* ss = "hello write\n";
    write(1,ss,strlen(ss));

    //
    fork();
    return 0;
}
